Vol. 2, Issue 4 (2014)
Aluminium toxicity and resistance in wheat genotypes
Author(s): Nidhi Gupta, S.S. Gaurav
Abstract: Aluminium is the most ample metallic element and ranks third in abundance as chemical element in the Earth’s crust after oxygen and silicon. Aluminium toxicity is one of the major agronomic problems and is considered as the most important growth-limiting factor for plants in acid soils worldwide thus, inhibiting plant growth and development. While many crops are resistant or tolerant to acid soils, important grain crops such as wheat are less tolerant and thus, results in low yields. The toxic effects of aluminium prevent nutrients uptake and water absorption which are essential for cellular metabolism, resulting in reduction of plant quality and yield. A combination of proper use of fertilizers, amending of acid soils, sustainable management practices and aluminium tolerant varieties may improve crop yields and fertility in acid soils. Moreover, it is suggested that solid organic matter can hold aluminium by adsorption. It has also been suggested that organic anions bind aluminium in the rhizosphere to form nontoxic, thus harmless complexes, which helps in reducing aluminium accumulation in root cell wall. This paper reports the results of release of organic acids in response to metal stress on different wheat cultivars. Increase in aluminum toxicity increased the release of organic acid from plants roots.